1. Toss the potatoes with oil and salt to coat evenly.
2. Coat a large microwave-proof plate with cooking spray. Arrange some potato slices in a single layer on the plate. Microwave, uncovered, on high until some slices start to brown (2-3 minutes).
3. Turn the slices over and continue microwaving until they start to crisp and brown around the edges (2-4 minutes). Check frequently and rearrange slices as needed to prevent scorching. Repeat with the remaining potato slices.